Machine for rolling annular blanks



May 3, 1960 G. E. GOLLWITZER MACHINE FOR ROLLING ANNULAR BLANKS Filed Dec.

5 Sheets-Sheet 1 INVENTOR. Ge

A .'TORNE 1 3 i May 3, 1960 G. E. GoLLwfzER 2,935,113

y MACHINE FOR ROLLING ANNULAR BLANKS Filed Dec. 19, 1955 5 Sheets-Sheet 2 INVENTOR. GEORGE &ro/v GoLL wrzen BY de; F

y 1960 G. E. GOLLWITZER 2,935,ll3

` MACHINE FOR ROLLING ANNULAR BLANKS 5 Sheets-Sheet 3 Filed Dec. 19, 1955 /I/ /////////////////////////fl/fl IN V EN TOR. 650945 &ro/v GoLLw/rzER %431 ,44

A 'rrop/ 573 v May 3, 1960 G. E. GOLLWITZER & 5 1

MACHINE FOR ROLLING ANNULAR BLANKS Filed Dec. 19,'1955 5 Sheets-Sheet 4 II. E- 4' INVENTOR. v GEORGE [L TON Gp. W/TZER' %m e MY May 3,' 1960 MACHINE FOR ROLLING ANNULAR BLANKS Filed Dec. 19, 1955 G. E. GOLLWITZER 2,935,11 3 v 5 sheets-steets I INVENTOR. Geo/?ae EL rov GoLL W/TZER BY WM um v" United States Patent O MACHINE FOR ROLLING ANNULAR BLANKS George Elton Gollwitzer, McKeesport, Pa., assignor to Kelsey-Hayes Company, a corporation of Delaware Application December 19, 1955, Serial No. 553,994

9 Claims. (c. ISS-28) The present invention relates to an improved machine for rolling annular steel blanks, for example, in the forming of drop center type automotive wheel rims.

It is a general object of the invention to provide a rolling machine especially devised to handle blanks of relatively heavy gauge stock, such as employed in rims for trucks, trailers and the like. To this end the machine is a massive one whose various improvements reside primarily in its improved types and arrangements of rigid and rugged, heavy duty parts. An example is the improved organization of the bearings for the forming roll shafting of the machine in relation to its force applying means, its load supports, and the like. i

It is another object of the inventon to provide heavy duty equipment of the foregoing sort characterized by upper and lower frames pvotally connected for movement toward and from one another under hydraulic force. These frames journal adjacent their outer arc of swing, an upper longitudinal shaft' and a parallel lower shaft, respectively, to which coacting rim forming rollers are appled, and the shafts are driven at different speeds in the rolling operation.

In accordance with the object stated in the preceding upper forming roll shaft is thus well and rigidly braced at its three journals tostrongly resst radial defiection.

It is `a further object to provide a rolling machine of the sort described in which the lower formng roll shaft is journaled in an improved manner on the bottom frame of the machine at two points, one in vertical alignment with the driving end hearing of the .upper shaft and the other closely adjacent but outboard of the intermediate hearing of the upper roll shaft. has a hearing closely adjacent and immediately outboard of the vertical line of application of hydraulic force to the top frame. The lower shaftprojects outwardly from the last named hearing, and has provsion at this other wise unsupported overhang to rotatvely receive and key a lower forming roll, for coaction with the upper shaft roll in rolling a rim blank. A lower shaft journaling structure of this typehas maximum ability to receive verti cal thrust at the forming rolls and minimizes shaft defiection under such thrust. r

A still further and more specific object of the invention is t provide a journaling arrangement for one of the forming roll shafts, illustrated as the lower shaft, in which angularly self-adjusting, self-aligning bearngs are employed at its two journals to accommodate and dstributesuchslight radial deflection as may arise under Thus the lower shaft 'ice the extremely heavy vertical thrust on the shafting in operation.

In accordance with another specific object of the invention, hydraulic power is appled to the top frame of the machine preferably at a point which is in the transverse vertical plane of the intermediate upper shaft bearng and spaced laterally outwardly from the forming roll shafts, in relation to the pivotal axis of the top frame, through the agency of an improved ball and socket type, double acting swvel connection. `Power is appled to the connection by a vertically extending hydraulic plunger mechanism pivoted at its base on the bottom frame, and special enlarged socket provision is made at a lower thrust ball portion of the swvel connection to accommodate and dstribute well the heavy downward force on the top frame attending a limited relative angular movement of the plunger mechanism and top frame. The hydraulic mechanism may have upward thrust engagement with the top frame through coacting ball and socket means of the swvel connection which are of relatively small effective hearing area, inasmuch as the forces involved in this upward action are relatively smallin comparison with the forces transmitted in rolling.

Yet another object of the invention is to provide a rolling machine as described in the preceding` paragraphs, in which adjustable stop means is provided to limit the relative approaching movements of the top and bottom frames of the machine. Such means takes the form of an adjustable telescoping stop post or posts located `in a vertical zone spaced substantially from the hydraulic` mechanism in the direction of the longitudinally extend- It absorbs the twistingfi ing roll shafts of the machine. torque set up `at a relatively free, unsupported end of the top frame, and thus confines shaft defiection to the lowe shaft length between the self-adjusting bearings mentioned above.

In accordance with a still further object of the invention, provision is made, in order to properly align verti cally the forming rolls on the upper and lower shafts, to adjust the top frame of the machine bodily in the' direction of the shafting. This adjustment is effected through novel provisions, located at a hinge pivoting the i top frame to the bottom frame and causing the former` to Shift lengthwise along this pivot. Again, the adjusting and hinging provisions in this pivotal zone are of very Figure 1, illustratng the hearing and shafting provisions of the machine as viewed in front elevation, and also showing in dot-dash line its driving provisions;

Figure 3 is a 'further elevation of the machine, as viewed from the end thereof opposite that appearing in Figure l;

Figure 4 is a view in vertical section through the roll shafts of the machine, along a line corresponding to line 4-4 of Figure 1; U i j Figure 5 is a similar vertical section through the frame pivot axis, .e. along line 5-5 of Figures 1 and 3; i

Figure 6 is a fragmentary view in elevation; as seen from the right in Figure l, of the hydraulic power operating device of the machine, this view also being partially e sectioned along line 6-6 of Figure 1;`

Figure 7 is a view in horizontal section of the hydraulic device, taken along line 7--7 of Figures l and 6; and

Figure 8 is an elevational view, approximately as seen from line 8-8 of Figure 2, showing an improved adjustable vertical stop between the top and bottom frames of the machine. V

Referring first to Figures l, 2 and 3 of the drawings, the machine of the invention comprises a rugged and massive fixed bottom or base frame 10, shown as being of bpXed Construction and internally well braced to sustain the heavy load it bears. This frame houses a lower shaft driving motor 11. The upper table portion or surface 12 of the frame is provided adjacent its rear margin, i.e. on the left as viewed in Figure 1, with appropriate means to pivotally hinge a top frame of the machine, generally designated 13. The frame 13 is of rigid, welded I-beam Construction, well braced in its longitudinal and transverse direction.

In all of the figures the frames 10 and 13 are shown in their approached, operative relation to one another for rolling.

Referring now to Figure 5 in conjunction with Figures 1 and 3, the frame hinging provisions referred to comprise a rigid, massive upright bearing bracket 14 at the left of table 12 (as viewed in Figure 5) and an equally strong, vertically adjustable bearing support 15 at the opposite end of the table. r

The support 15 comprises a non-rotative cylndrical column 16 having a capstan type adjusting nut 17 threaded thereon, which nut seats downwardly on the bottom frame table 12 and is restrained from upward movement by an overhanging clamp 17' screwed on the table. Rotative manipulation of the nut 17 vertically adjusts a heavy duty hinge bearing block 18 fixedly supported by column 16, in ordertto horizontally align its -axis with that of a bearing block 19 sustained by the opposite bearing bracket 14. Structural details of the top frame bearings 18, 19 have no particular bearing on the inventon, other than in respect to axial adjusting provisiors for the top frame associated with one thereof, to be described. However, these journals should be very sturdy ones, capable of efficiently fulcruming the heavy frame under heavy transverse or radial load. V j

Referring particularly to Figure S, the bearings 18, 19 rotatably journal a rear hinge shaft 20 on which depending hinges 21 and 22 of the top frame 13 are received for oscillatory movement In the case of the hnge 21, asimple flanged bushing 23 provides this hinge, while iri the case of hiuge 22 a flanged adjusting nut 24 bolted to that hinge threadedly receives at 25 a reduced outer neck portion 26 of the hinge shaft 20. A eapstau type plate 27 is bolted to the outer end of this reduced shaft portion to permit ready rotative adjustment of shaft 20.

'Rotation of the hinge shaft, through its threaded con- V nection 25 to the frame hinge 22, causes the frame 13 to be shifted longitudinally or axially on the shaft 20 in one drecton or the other, since the shaft is held from longitudmal movement. This is accomplished by means of a capstan type thrust nut 28 threaded at 29 onto an intermediate portion of the shaft 20, the nut 28 having an axally extending sleeve portion 30 which extends into the bearing block 19 'and into axially abutting engagement with a radial shoulder 31 on shaft 20 inwardly of the bearing block, as well as with an adjacent surface of an nner bearing race in the block 14. Movement of the shaft 20 in the opposte axial direction is similarly resisted by the axial engagement of :a further enlarged shoulder` 32 thereon with the inner bearing race.

'In order to adjust top frame 13 in either direction longitudnally, thus adjusting the upper form roll shaft correspondingly,` the shaft plate 27 is rotated in either directon to shift the frame by the threading action at 25. The shaft 20 and thrust nut 28 simply rotate in the fixed bearngs 18, 19. The nut 28 holds the inner race of bearing 14 against shoulder 32.

The bottom frame table 12 is provided adjacent its standing bearing blocks 35, 36 by which a lower forming roll shaft 37 is rotatably mounted. The right hand end of the shaft 37 (as viewed in Figures 2 and 4) extends outwardly of the bearing 36, where it has a multiple sheave pulley 38 Secured thereon. Pulley 38 is connected by driver belts 39 with a similar pulley 40 of smaller diameter fixed to the shaft of driving motor 11 (Figure 1).

The opposite end of lower shaft 37 projects outwardly of bearing block 35, where it non-rotatively receives a lower forming roller 41 appropriately contoured to form one of the progressive cross-sectional outlines of an annular rim rolled by the machine.

By reference to Figure 4 of the drawings, it will be noted that the bearing blocks 35, 36 for lower roll shaft 37 support bearings 42 which are of the angularly selfaligning type. The machine has provisions (to be described) to minimize or neutralize twisting Stress in the top frame 13 under load, and thus to confine any existing radial or transverse twist or defiection of the shaft 37 to the length thereof between bearing blocks 35, 36, so that it is seen that the self-algning bearings 42 will readily accommodate such minor deection.

The top, frame 13 rotatably journals the upper forming roll shaft 44 of the machine, directly above shaft 37, through the agency of three heavy duty bearings fixed to and depending from frame 13. These include a roller bearing carried in an outboard end bearing block 45 adjacent the front or free swinging end of the frame; a roller bearing in an intermediate bearing block 46 located' in a plane paralleling and directly inside that of lower shaft bearing block 35; and a further roller bearing in an end bearing .block 47 directly above the block 36.' v

A sprocket 48 is Secured to upper roll shaft 44 outwardly of bearing 47, and this spi-ceket is driven by a chain connection 49 from a driving sprocket 50 fixed on the shaft of a speed reducer 51, which reducer is powered by an upper electric motor 52. The motor and speed reducer are appropria'tely mounted on the upper' surface of I-bean constructed top frame 13.

The upper shaft 44 has an upper forming roll 54 keyed or splined thereto in its outboard journaled length betweenthe bearing block 45 and the intermediate bearing block 46 of frame 13. The rolls 41 and 54 are cross sectionally shaped for coaction with an annular blank (not shown) in one of the Progressive rolling stages to produce a wheel rim, designated W.

As appearing in Figures 1 and 6, the reference nu meral 56 -generally designates a hydraulc power mechanism or device controlling the downward and upward swinging movements of top frame 13 to bring shaft roll 54 to and from roll 41 for the rolling operation, and general referencetto certain details of the hydraulc system of this device will hereinafter be made. hydraulc device 56-includes a bottom depending hingc tongue or extension 57 which is pivotally mounted by a pin 58 between upstanding brackets 58' projecting from the front side of the bottom frame 10, at the bottom of the latter. The device 56 is swiveled at its top to the top frame 13 'by means of an improved ball and socket connection, generally designated 59, and here it Will be best noted by special reference'to Figure 2 that the vertical line'of application of hydraulc force by the device 56 is approximately in the vertical transverse plane of the depending intermediate bearing block 46 ot' v the top frame 13 and, most important, through frame hingebearug 19 and just inside the bottom frame bear' ing 35. The adjustment of the top frame 13 longitudinally of shaft 20 by rotation of the shaft is usually of a minor degree which will not affect the pivot connection between pin 58 andtongue 57 'of the hydraulc device. However, if desired, shims or washers may be provided on the pin distributed on either side of the tongue be- I twen'the tongue and the 'brackets 58' to properly align The' 'a a a-,rra-

thehydraulicdevice 56 according to: minor' adjustments ofi theframe 13. i

Reference should be made to Figure 1 of the drawings for structural details of the swivel connection' 59. It includes a cupped or vertically flanged, center apertured lower' socket block 61 which rests on and is secured to a boxed forward extension 62 of the top frame 13, the block 61 opening downwardly through the extension. The interor of this block receives a bronze socket bushing 63' which has its upper surface contouredat 64 in a partially spherical shape of relatively large hearing area. The socket seat thus formed is engaged by a partially spherical lower'thrust ball 65 of similiar diamet'er. The ball 65 is fixedly secured on theupper eX- tremit-y' of a vertical coupling 66 fixedly connectng it of the hydraulic power device 56.

An upper hearing cover plate 68 is mounted in fixed, predeterminedly spaced relation to the socket 63 by means of aplurality of bolts or studs 69 and interposed spacer sl'eeves 70. The plate 68 is centrally recessed at 71 to receive an upper bronze thrust socket 72, in which the partially spherical surface 73 of an upwardly acting thrust member 74 is received. The member 74 may be a rigidly' connected part of the ball coupling 66 on which the lower thrust ball 65 is carried.

The socket block 61 and socket 63 are centrally apertured at 75 to receive the fitting 66 and accommodate its angular movement relative to the block 61 in the elevating and' lowering movements of hydraulic connecting rod 66. To this end, a lateral enlargement 76 of the aperture 75 permits a considerable relative Swing in a plane at 90 degrees' to the pivotal axis of the top frame 13.

The hydraulic power mechanism 56 of the machine is' an extremely compact one, and a considerable portion of` the val /ing and other hydraulic flow and control structure involved in its operation is self-contained in the pivotally mounted unit shown in Figure 1 of the drawings; Reference should also be had to Figura 6 in connection-with these further features.

-The device 56 includes a lower, internally ported and manifolded cylnder head 79 having a downwardly` extending pivotng extension or tongue 57 which is hinged by -a pin 58 on the forwardly extending bottom brackets 58' of the bottom frame 10. A further depending union 80 of the bottom cylnder head 79 is received to one side of the brac'kets 58'.

The power transmitting rod 67 is an integral upper extension of an upper piston rod 81 which extends vertically through an upper cylnder head 82, through the interier of which hydraulic pressure is appled. Rod 81 is -appropriately sealed in sliding relation to the head and carries a suitably packed pisten 83 which slides in a cylnder 84 rigidly bolted between the upper and lower cylnder heads 79, 82. A cushioning collar 85 is applied to piston rod 81 .on the upper side of the piston 83.

A lower plunger-like continuation 86 of pisten rod 81 extends into an axial bore 87 in the lower manifolded cylnder head 79, Where it is provided With a packing 88 and defines a pressure space 89 between the plunger end and the bottom wall 90 of the bore 87. Hydraulic pressure is applied from lower cylnder head 79 to this space to elevate the piston rod 81 and raise the-top` frame 13 of the` machine, thus to separate the forming rollers 41, 54. The pressure space 92 defined'in cylnder 84 between the upper side of piston 83 and the cylnder end is of substantially greater cross-sectional area. The rolls 41, 54 are brought rapidly into approximate'rolling position by gravity; and hydraulic pressure admitted to the space` 92 of the cylnder head 82 drives the piston rod 81 downwardly through a work stroke to bring the forming rolls' 41, 54 into their operative, rolling relation illustrated in the other figures.

--'Approprate provisions in the way ofpassaging portggrmanifolding and the like are made in the lower and r upper cylnder heads 79, 82` to enable a rev rsing -flow of hydraulic power liquid theren. The details of these arrangements have no particular bearing on the invention, hence are not illustrated. Likewise, the heads 79, 82 have externally applied thereto housing members, as. generally designated by the reference numeral 93, to house various relief, check and pilot valves, or similar structure required in the efficient control of the reversing of the hydraulic liquid. Here again, the special provisions are conventional in character and call for no further illustration or description.

As illustrated in Fig. 1, the cylnder heads 79, 82 are operatively placed in liquid flow communication with the" control means referred to, and with the hydraulic system (not shown) powering the mechanism 56, by a flexible low pressure exhaust hose 94 sealed at its opposite ends to the respective heads. 'Further high pressure steel piping 95 connects the cylnder heads 79, 82 to transmit hydraulic fluid under considerable pressure from the hydraulc system. This system will of course include ap-` propriate pumping means and connecting conduitry (not shown) of known sort. The lower cylnder head 79 may also carry external housing structure 96 enclosing solenoid operated control devices such as are involved in the electrical control (through further circuitry, not shown) of the hydraulic power means.

As illustrated in Fig. 2, the line of application of hydraulic thrust by the mechanism 56 is in a vertical plane centered between the bracket parts 58' pivoting the mechanism and extending through the center of theintermediate hearing 46 of the upper forming roll ,shaft 44,

as well as .through the hearing 19 of the frame hinge.

The hearing arrangement is such as to absorb the thrust on the shaft without serious radial defiection. In order to ofiset vertical wracking or twisting stresses set up through the top frame 13 under the heavy downward thrust applied thereto at swiveling connection 59 (in the vertical line of power transmission just referred to), the invention contemplates the provision of a novel adjustable stop device between the top and bottom frames 13, 10, such as appears in 'Fgures 2 and 8 of the drawings.

As illustrated in Figure 2, this device, generally designated 97, is located between the forward edges of the two frames and in a vertical plane extending transverse of the shafts 37, 44 through their right hand end bearings 36, '47 respectvely. v

The stop device 97 comprises the generally similar top and bottom socket members 98, 99 of L-shaped cross-sectionaloutline, which are bolted respectively to projecting base flanges 100, 101 of the bearings 47, 36, each socket member receiving a generally spherical thrust ball 102. The balls are held in swiveling relation to the sockets by means of retainer plates 103. The socket members 98, 99 are secured by screws to the hearing flanges and the retainer plates are similarly secured to th sockets, as shown in Figure 8.

The lower` thrust ball 102 of the device -97 has an' integral thrust plurger 104 extendng upwardly thereof theplunger being necked down at 104' adjacent the ball.

Theplunger 104 is received for vertical telescoping relatively sliding movement in -an elongated thrust sleeve 105-- Accordingly, as the top frame 13 is lowered and ele-- vated pivotally relative to the bottom frame 10, the

plunger 104 and sleeve 105 have a stable relatively` sliding, telescoping, movement; and the lower end of sleeve 7, insert 108 axially abuts the upper end of plunger 104 when the top frame 13 is fully lowered. A considerable cantilever load on top frame 13 is'thus transmitted by` erative length of stop device 97 and tins eitect the desired adjustment. Opposite manipulation adjusts the top in the opposite direction. Lock nut 167 is taken up in either case into engagement with the top of insert 103.

It is seen from the above that a rugged, heavy duty machine is provided for the rolling of relatively heavy gauge material, such `as the steel blanks employed in fabricating truck rims, etc. In operation the blanks are fed endwise onto the lower forming roll 41 when the top frame is elevated and progressive rolling of the blank is performed between the rolls 41, 54 when, the shafts 37, 44 are driven with the top frame 13 fully lowered. The lower shaft is driven at a substantially higher rate than the upper. In respect to the rolling operation itself, the function .of the machine is in the main conventional. However, it is far superior to existing machinery of the same general type in respect to its improved provisions for journaling the shafts 37, 44 for -an absolute minimum of deflection under heavy load, absorbing what minor deflection may come into being. The machine is also novel and noteworthy in its improved features for hydraulically engaging and disengaging the shafts through a special ball and socket coupling, for relatively adjusting the rolls 41, 54 -by a longitudinal bodily adjustment of the entire top frame ,13, and for strongly bracing this severely stressed movable member.

'Ibe .drawings and the foregoing specification constitute a description of the improved machine for rolling annular blanks in such full, clear, concise and exact terms as to enable any person skilled in the art to practice the nvention, the scope of which is indicated by the appended claims.

What I claim as my invention is:

1. Blank rolling apparatus comprising a base frame and amovable frame pivoted at its rear edge to the rear edge of said base frame for movement toward and away from an operative position adjacent said base frame, shafts rotatably carried by said respective frames forwardly of the pivot axis of said movable frame extending parallel to said pivot aXis and respectively carrying forming rolls near one end of said shafts cooperable to roll a blank in said operative position of said movable frame, a stop device extending between said frames adjacent said shafts and in spaced relation to said forming rolls in a direction parallel to said shafts for preventing movement of said movable frame toward said base `frame beyond said operative position, and a power device for pivoting said movable frame and acting on' said movable frame at a point between the fonning roll thereon and said stop device and in a plane perpendicular to said shafts.

2. Blank rolling apparatus comprising a base frame and a movable frame pivoted at its rear edge to the rear edge of said base frame for movement toward and away i rolls in a direction parallel to said shafts for preventing' movement of said movable frame toward said base frame beyond said operative position, said stop device comprising relatively' slidable members swivelled on said respective frames and having abutment parts engageable upon' movement of said movable frame toward said base frame to determine said operative position, and a power device for .pivoting said movable frame and actng on said movable frame at a point between the forming` roll thereon and said stop device and in a plane pemen-- dicular to said shafts.

3. Blank rolling apparatus comprising a base frame and a movable frame pivoted at its rear edge to the rear edge of said base frame for movement toward and away from an operative position adjacent said base frame, shafts rotatably carried by said respective frames, for

wardly of the pivot axis of said movable frame extending forming rolls near one end of said shafts cooperable to v roll a blank in said operative position of said movable frame, a stop device extending between said frames adjacent said shafts and in spaced relaton to said forming rolls in a direction parallel to said shafts for preventing movement of said movable frame toward said base frame beyond said operative position, said stop device comprising relatively slidable telescoping members swivelled on said respective frames and having relatively adjustable abutment parts engageable upon movement of said movable frame toward said base frame to determine said operative position, and a hydraulic power device for pivoting said movable frame and acting on said movable frame in a plane perpendicular to said shafts at a point between the forming roll on said movable frame and said stop device and forwardly thereof.

4. Blank rolling apparatus comprising a base frame, a movable frame, means pivoting said movable frame at its rear edge to the rear edge of said base frame for movement toward and away 'from an operative position adjacent said base frame, shafts rotatably carried by said respective frames forwardly of the pivot axis of said movable frame extending parallel to said pivot aXis and respectively carrying forming rolls near one end of said shafts cooperable to roll a blank in the operative position of said movable frame, a stop device extending between said frames adjacent said shafts and in spaced relation to said forming rolls in a direction parallel to said shafts for preventing movement of said movable frame toward said base frame beyond said operative position, and a power device for pivoting said movable frame and acting on said movable frame in a plane perpendcular to said shafts at a point between the forming roll on said movable frame and said stop device and -forwardly thereof, said pivoting means ,for said movable frame comprising a bearing on said base frame in said plane of action of said power device.

5. Apparatus as in claim 4 in which the shaft on said movable frame is supported thereon for rotation by spaced bearings one of which lies in said plane of action `of said power device.

adjacent said base frame, shafts rotatably carried by said I respective frames forwardly of the pivot axis of said movable frame extending parallel to said pivot aXis and respectively carrying forming rolls near one end of said i shafts cooperable to roll a blank in the operative position of said movable frame, a stop device extending between sad frames adjacent said shafts and in spaced relation to said forming rolls in a direction parallel to said shafts for preventing movement of said movable frame toward said base frame beyond said operative position, said stop device comprising relatively slidable telescoping members swivelled on said respective frames and having relatively adjustable abutment parts engageable upon movement` of said movable'frame toward said base frame to deternine said operative position, a power device for pivoting i said movable frame and acting on said movable frame in a plane perpendicular to said shafts at a point between the forming roll on said movable frame and said stop device and forwardly thereof, said pivoting means for said movable frame comprising a bearing on said base frame in said plane of action of said power device, the shaft on said mo-vable frame being supported thereor for rotation by spaced bearings one of which lies in said plane of action of said power device, the other shaft being supported on said base frame by spaced bearings one of which lies closely adjacent tosaid plane of action of said power device, and another of the bearings for each shaft lying in a plane perpendicular to said shafts through said stop device.

7. Blank ro-lling apparatus comprisng a base frame, a movable frame, means pivoting said movable frame to said base frame for movement toward and away from an operative position adjacent said base frame, forming rolls carried by said frames in spaced relation to said pivoting means for rolling a blank in the operative position of said movable frame, said pivoting means comprising a shaft and bearing means on said base frame supporting said shaft for rotation, means holding said shaft against axial movement relative to said base frame, and hearing means on said movable frame engagng said shaft and including a nut rigid with said movable frame and threadedly engaging said shaft to enable adjustment of said movable frame axially of said shaft by rotation of the latter, said hearing means on said movable frame having a greater resistance to rotation of said shaft than said bearing means on said base frame to assure rotation of said shaft' with said movable frame during normal pivoting of the, latter.

8. Blank rolling apparatus comprsing a base frame, a movable frame, means pivoting said movable frame at its rear' edge to the rear edge of said base frame for movement toward and away from an operative position adjacent said base frame, shafts rotatably carried by said respective frames forwardly of the pivot aXis of said movable frame extending parallel to said pivot axis and respectively carrying forming rolls cooperable to roll a blank in the operative position of said movable frame, said pivoting means comprising a pivot shaft and hearing means on said base frame supporting said pivot shaft for rota-tion, means holding said pivot shaft from axial movement relative to said base frame, and hearing means on said movable frame engageable with said pivot shaft and including a nut rigid with said movable frame and threadedly engaging said pivot shaft to enable adjustment of said movable frame axially of said pivot shaft by rotation of the latter, said hearing means on said movable frame having a greater resistance to rotation of said shaft than said bearing means on said base frame to assure rotation of said shaft with said movable frame during normal pivoting of the latter.

9. Blank rolling apparatus comprising a base frame and a movable frame pivoted at its rear edge to the rear edge of said base frame for movement toward and away from an operative position adjacent said base frame, rotatable forming rolls carried by said respective frames forwardly of the pivot aXis of said movable frame and With their axes parallel to said pivot axis, said forming rolls being cooperable to roll a blank in said operative position of said movable frame, a stop device spaced from said rolls axially thereof and extending between said frames for preventing movement of said movable frame toward said base frame beyond said operative position, and a power device for pivoting said movable frame and acting on said movable frame at a point between the forming roll thereon and said stop device.

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